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	<h1>Kustomize Components</h1>
	<div class="lead">Kustomize components guide</div>
	<p>As of <code>v3.7.0</code> Kustomize supports a special type of kustomization that allows
one to define reusable pieces of configuration logic that can be included from
multiple overlays.</p>
<p>Components come in handy when dealing with applications that support multiple
optional features and you wish to enable only a subset of them in different
overlays, i.e., different features for different environments or audiences.</p>
<p>For more details regarding this feature you can read the
<a href="https://github.com/kubernetes/enhancements/blob/master/keps/sig-cli/1802-kustomize-components.md">Kustomize Components KEP</a>.</p>
<h2 id="use-case">Use case</h2>
<p>Suppose you&rsquo;ve written a very simple Web application:</p>
<div class="highlight"><pre style="background-color:#f8f8f8;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-yaml" data-lang="yaml"><span style="color:#204a87;font-weight:bold">apiVersion</span><span style="color:#000;font-weight:bold">:</span><span style="color:#f8f8f8;text-decoration:underline"> </span>apps/v1<span style="color:#f8f8f8;text-decoration:underline">
</span><span style="color:#f8f8f8;text-decoration:underline"></span><span style="color:#204a87;font-weight:bold">kind</span><span style="color:#000;font-weight:bold">:</span><span style="color:#f8f8f8;text-decoration:underline"> </span>Deployment<span style="color:#f8f8f8;text-decoration:underline">
</span><span style="color:#f8f8f8;text-decoration:underline"></span><span style="color:#204a87;font-weight:bold">metadata</span><span style="color:#000;font-weight:bold">:</span><span style="color:#f8f8f8;text-decoration:underline">
</span><span style="color:#f8f8f8;text-decoration:underline">  </span><span style="color:#204a87;font-weight:bold">name</span><span style="color:#000;font-weight:bold">:</span><span style="color:#f8f8f8;text-decoration:underline"> </span>example<span style="color:#f8f8f8;text-decoration:underline">
</span><span style="color:#f8f8f8;text-decoration:underline"></span><span style="color:#204a87;font-weight:bold">spec</span><span style="color:#000;font-weight:bold">:</span><span style="color:#f8f8f8;text-decoration:underline">
</span><span style="color:#f8f8f8;text-decoration:underline">  </span><span style="color:#204a87;font-weight:bold">template</span><span style="color:#000;font-weight:bold">:</span><span style="color:#f8f8f8;text-decoration:underline">
</span><span style="color:#f8f8f8;text-decoration:underline">    </span><span style="color:#204a87;font-weight:bold">spec</span><span style="color:#000;font-weight:bold">:</span><span style="color:#f8f8f8;text-decoration:underline">
</span><span style="color:#f8f8f8;text-decoration:underline">      </span><span style="color:#204a87;font-weight:bold">containers</span><span style="color:#000;font-weight:bold">:</span><span style="color:#f8f8f8;text-decoration:underline">
</span><span style="color:#f8f8f8;text-decoration:underline">      </span>- <span style="color:#204a87;font-weight:bold">name</span><span style="color:#000;font-weight:bold">:</span><span style="color:#f8f8f8;text-decoration:underline"> </span>example<span style="color:#f8f8f8;text-decoration:underline">
</span><span style="color:#f8f8f8;text-decoration:underline">        </span><span style="color:#204a87;font-weight:bold">image</span><span style="color:#000;font-weight:bold">:</span><span style="color:#f8f8f8;text-decoration:underline"> </span>example<span style="color:#000;font-weight:bold">:</span><span style="color:#0000cf;font-weight:bold">1.0</span><span style="color:#f8f8f8;text-decoration:underline">
</span></code></pre></div><p>You want to deploy a <strong>community</strong> edition of this application as SaaS, so you
add support for persistence (e.g. an external database), and bot detection
(e.g. Google reCAPTCHA).</p>
<p>You&rsquo;ve now attracted <strong>enterprise</strong> customers who want to deploy it
on-premises, so you add LDAP support, and disable Google reCAPTCHA. At the same
time, the <strong>devs</strong> need to be able to test parts of the application, so they
want to deploy it with some features enabled and others not.</p>
<p>Here&rsquo;s a matrix with the deployments of this application and the features
enabled for each one:</p>
<table>
<thead>
<tr>
<th></th>
<th align="center">External DB</th>
<th align="center">LDAP</th>
<th align="center">reCAPTCHA</th>
</tr>
</thead>
<tbody>
<tr>
<td>Community</td>
<td align="center">✔️</td>
<td align="center"></td>
<td align="center">✔️</td>
</tr>
<tr>
<td>Enterprise</td>
<td align="center">✔️</td>
<td align="center">✔️</td>
<td align="center"></td>
</tr>
<tr>
<td>Dev</td>
<td align="center">✅</td>
<td align="center">✅</td>
<td align="center">✅</td>
</tr>
</tbody>
</table>
<p>(✔️ enabled, ✅: optional)</p>
<p>So, you want to make it easy to deploy your application in any of the above
three environments. Here&rsquo;s how you can do this with Kustomize components: each
opt-in feature gets packaged as a component, so that it can be referred to from
multiple higher-level overlays.</p>
<p>First, define a place to work:</p>
<div class="highlight"><pre style="background-color:#f8f8f8;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-shell" data-lang="shell"><span style="color:#000">DEMO_HOME</span><span style="color:#ce5c00;font-weight:bold">=</span><span style="color:#204a87;font-weight:bold">$(</span>mktemp -d<span style="color:#204a87;font-weight:bold">)</span>
</code></pre></div><p>Define a common <strong>base</strong> that has a <code>Deployment</code> and a simple <code>ConfigMap</code>, that
is mounted on the application&rsquo;s container.</p>
<div class="highlight"><pre style="background-color:#f8f8f8;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-shell" data-lang="shell"><span style="color:#000">BASE</span><span style="color:#ce5c00;font-weight:bold">=</span><span style="color:#000">$DEMO_HOME</span>/base
mkdir <span style="color:#000">$BASE</span>

cat <span style="color:#4e9a06">&lt;&lt;EOF &gt;$BASE/kustomization.yaml
</span><span style="color:#4e9a06">resources:
</span><span style="color:#4e9a06">- deployment.yaml
</span><span style="color:#4e9a06">
</span><span style="color:#4e9a06">configMapGenerator:
</span><span style="color:#4e9a06">- name: conf
</span><span style="color:#4e9a06">  literals:
</span><span style="color:#4e9a06">    - main.conf=|
</span><span style="color:#4e9a06">        color=cornflower_blue
</span><span style="color:#4e9a06">        log_level=info
</span><span style="color:#4e9a06">EOF</span>

cat <span style="color:#4e9a06">&lt;&lt;EOF &gt;$BASE/deployment.yaml
</span><span style="color:#4e9a06">apiVersion: apps/v1
</span><span style="color:#4e9a06">kind: Deployment
</span><span style="color:#4e9a06">metadata:
</span><span style="color:#4e9a06">  name: example
</span><span style="color:#4e9a06">spec:
</span><span style="color:#4e9a06">  template:
</span><span style="color:#4e9a06">    spec:
</span><span style="color:#4e9a06">      containers:
</span><span style="color:#4e9a06">      - name: example
</span><span style="color:#4e9a06">        image: example:1.0
</span><span style="color:#4e9a06">        volumeMounts:
</span><span style="color:#4e9a06">        - name: conf
</span><span style="color:#4e9a06">          mountPath: /etc/config
</span><span style="color:#4e9a06">      volumes:
</span><span style="color:#4e9a06">        - name: conf
</span><span style="color:#4e9a06">          configMap:
</span><span style="color:#4e9a06">            name: conf
</span><span style="color:#4e9a06">EOF</span>
</code></pre></div><p>Define an <code>external_db</code> component, using <code>kind: Component</code>, that creates a
<code>Secret</code> for the DB password and a new entry in the <code>ConfigMap</code>:</p>
<div class="highlight"><pre style="background-color:#f8f8f8;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-shell" data-lang="shell"><span style="color:#000">EXT_DB</span><span style="color:#ce5c00;font-weight:bold">=</span><span style="color:#000">$DEMO_HOME</span>/components/external_db
mkdir -p <span style="color:#000">$EXT_DB</span>

cat <span style="color:#4e9a06">&lt;&lt;EOF &gt;$EXT_DB/kustomization.yaml
</span><span style="color:#4e9a06">apiVersion: kustomize.config.k8s.io/v1alpha1  # &lt;-- Component notation
</span><span style="color:#4e9a06">kind: Component
</span><span style="color:#4e9a06">
</span><span style="color:#4e9a06">secretGenerator:
</span><span style="color:#4e9a06">- name: dbpass
</span><span style="color:#4e9a06">  files:
</span><span style="color:#4e9a06">    - dbpass.txt
</span><span style="color:#4e9a06">
</span><span style="color:#4e9a06">patchesStrategicMerge:
</span><span style="color:#4e9a06">  - configmap.yaml
</span><span style="color:#4e9a06">
</span><span style="color:#4e9a06">patchesJson6902:
</span><span style="color:#4e9a06">- target:
</span><span style="color:#4e9a06">    group: apps
</span><span style="color:#4e9a06">    version: v1
</span><span style="color:#4e9a06">    kind: Deployment
</span><span style="color:#4e9a06">    name: example
</span><span style="color:#4e9a06">  path: deployment.yaml
</span><span style="color:#4e9a06">EOF</span>

cat <span style="color:#4e9a06">&lt;&lt;EOF &gt;$EXT_DB/deployment.yaml
</span><span style="color:#4e9a06">- op: add
</span><span style="color:#4e9a06">  path: /spec/template/spec/volumes/0
</span><span style="color:#4e9a06">  value:
</span><span style="color:#4e9a06">    name: dbpass
</span><span style="color:#4e9a06">    secret:
</span><span style="color:#4e9a06">      secretName: dbpass
</span><span style="color:#4e9a06">- op: add
</span><span style="color:#4e9a06">  path: /spec/template/spec/containers/0/volumeMounts/0
</span><span style="color:#4e9a06">  value:
</span><span style="color:#4e9a06">    mountPath: /var/run/secrets/db/
</span><span style="color:#4e9a06">    name: dbpass
</span><span style="color:#4e9a06">EOF</span>

cat <span style="color:#4e9a06">&lt;&lt;EOF &gt;$EXT_DB/configmap.yaml
</span><span style="color:#4e9a06">apiVersion: v1
</span><span style="color:#4e9a06">kind: ConfigMap
</span><span style="color:#4e9a06">metadata:
</span><span style="color:#4e9a06">  name: conf
</span><span style="color:#4e9a06">data:
</span><span style="color:#4e9a06">  db.conf: |
</span><span style="color:#4e9a06">    endpoint=127.0.0.1:1234
</span><span style="color:#4e9a06">    name=app
</span><span style="color:#4e9a06">    user=admin
</span><span style="color:#4e9a06">    pass=/var/run/secrets/db/dbpass.txt
</span><span style="color:#4e9a06">EOF</span>
</code></pre></div><p>Define an <code>ldap</code> component, that creates a <code>Secret</code> for the LDAP password
and a new entry in the <code>ConfigMap</code>:</p>
<div class="highlight"><pre style="background-color:#f8f8f8;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-shell" data-lang="shell"><span style="color:#000">LDAP</span><span style="color:#ce5c00;font-weight:bold">=</span><span style="color:#000">$DEMO_HOME</span>/components/ldap
mkdir -p <span style="color:#000">$LDAP</span>

cat <span style="color:#4e9a06">&lt;&lt;EOF &gt;$LDAP/kustomization.yaml
</span><span style="color:#4e9a06">apiVersion: kustomize.config.k8s.io/v1alpha1
</span><span style="color:#4e9a06">kind: Component
</span><span style="color:#4e9a06">
</span><span style="color:#4e9a06">secretGenerator:
</span><span style="color:#4e9a06">- name: ldappass
</span><span style="color:#4e9a06">  files:
</span><span style="color:#4e9a06">    - ldappass.txt
</span><span style="color:#4e9a06">
</span><span style="color:#4e9a06">patchesStrategicMerge:
</span><span style="color:#4e9a06">  - configmap.yaml
</span><span style="color:#4e9a06">
</span><span style="color:#4e9a06">patchesJson6902:
</span><span style="color:#4e9a06">- target:
</span><span style="color:#4e9a06">    group: apps
</span><span style="color:#4e9a06">    version: v1
</span><span style="color:#4e9a06">    kind: Deployment
</span><span style="color:#4e9a06">    name: example
</span><span style="color:#4e9a06">  path: deployment.yaml
</span><span style="color:#4e9a06">EOF</span>

cat <span style="color:#4e9a06">&lt;&lt;EOF &gt;$LDAP/deployment.yaml
</span><span style="color:#4e9a06">- op: add
</span><span style="color:#4e9a06">  path: /spec/template/spec/volumes/0
</span><span style="color:#4e9a06">  value:
</span><span style="color:#4e9a06">    name: ldappass
</span><span style="color:#4e9a06">    secret:
</span><span style="color:#4e9a06">      secretName: ldappass
</span><span style="color:#4e9a06">- op: add
</span><span style="color:#4e9a06">  path: /spec/template/spec/containers/0/volumeMounts/0
</span><span style="color:#4e9a06">  value:
</span><span style="color:#4e9a06">    mountPath: /var/run/secrets/ldap/
</span><span style="color:#4e9a06">    name: ldappass
</span><span style="color:#4e9a06">EOF</span>

cat <span style="color:#4e9a06">&lt;&lt;EOF &gt;$LDAP/configmap.yaml
</span><span style="color:#4e9a06">apiVersion: v1
</span><span style="color:#4e9a06">kind: ConfigMap
</span><span style="color:#4e9a06">metadata:
</span><span style="color:#4e9a06">  name: conf
</span><span style="color:#4e9a06">data:
</span><span style="color:#4e9a06">  ldap.conf: |
</span><span style="color:#4e9a06">    endpoint=ldap://ldap.example.com
</span><span style="color:#4e9a06">    bindDN=cn=admin,dc=example,dc=com
</span><span style="color:#4e9a06">    pass=/var/run/secrets/ldap/ldappass.txt
</span><span style="color:#4e9a06">EOF</span>
</code></pre></div><p>Define a <code>recaptcha</code> component, that creates a <code>Secret</code> for the reCAPTCHA
site/secret keys and a new entry in the <code>ConfigMap</code>:</p>
<div class="highlight"><pre style="background-color:#f8f8f8;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-shell" data-lang="shell"><span style="color:#000">RECAPTCHA</span><span style="color:#ce5c00;font-weight:bold">=</span><span style="color:#000">$DEMO_HOME</span>/components/recaptcha
mkdir -p <span style="color:#000">$RECAPTCHA</span>

cat <span style="color:#4e9a06">&lt;&lt;EOF &gt;$RECAPTCHA/kustomization.yaml
</span><span style="color:#4e9a06">apiVersion: kustomize.config.k8s.io/v1alpha1
</span><span style="color:#4e9a06">kind: Component
</span><span style="color:#4e9a06">
</span><span style="color:#4e9a06">secretGenerator:
</span><span style="color:#4e9a06">- name: recaptcha
</span><span style="color:#4e9a06">  files:
</span><span style="color:#4e9a06">    - site_key.txt
</span><span style="color:#4e9a06">    - secret_key.txt
</span><span style="color:#4e9a06">
</span><span style="color:#4e9a06"># Updating the ConfigMap works with generators as well.
</span><span style="color:#4e9a06">configMapGenerator:
</span><span style="color:#4e9a06">- name: conf
</span><span style="color:#4e9a06">  behavior: merge
</span><span style="color:#4e9a06">  literals:
</span><span style="color:#4e9a06">    - recaptcha.conf=|
</span><span style="color:#4e9a06">        enabled=true
</span><span style="color:#4e9a06">        site_key=/var/run/secrets/recaptcha/site_key.txt
</span><span style="color:#4e9a06">        secret_key=/var/run/secrets/recaptcha/secret_key.txt
</span><span style="color:#4e9a06">
</span><span style="color:#4e9a06">patchesJson6902:
</span><span style="color:#4e9a06">- target:
</span><span style="color:#4e9a06">    group: apps
</span><span style="color:#4e9a06">    version: v1
</span><span style="color:#4e9a06">    kind: Deployment
</span><span style="color:#4e9a06">    name: example
</span><span style="color:#4e9a06">  path: deployment.yaml
</span><span style="color:#4e9a06">EOF</span>

cat <span style="color:#4e9a06">&lt;&lt;EOF &gt;$RECAPTCHA/deployment.yaml
</span><span style="color:#4e9a06">- op: add
</span><span style="color:#4e9a06">  path: /spec/template/spec/volumes/0
</span><span style="color:#4e9a06">  value:
</span><span style="color:#4e9a06">    name: recaptcha
</span><span style="color:#4e9a06">    secret:
</span><span style="color:#4e9a06">      secretName: recaptcha
</span><span style="color:#4e9a06">- op: add
</span><span style="color:#4e9a06">  path: /spec/template/spec/containers/0/volumeMounts/0
</span><span style="color:#4e9a06">  value:
</span><span style="color:#4e9a06">    mountPath: /var/run/secrets/recaptcha/
</span><span style="color:#4e9a06">    name: recaptcha
</span><span style="color:#4e9a06">EOF</span>
</code></pre></div><p>Define a <code>community</code> variant, that bundles the external DB and reCAPTCHA
components:</p>
<div class="highlight"><pre style="background-color:#f8f8f8;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-shell" data-lang="shell"><span style="color:#000">COMMUNITY</span><span style="color:#ce5c00;font-weight:bold">=</span><span style="color:#000">$DEMO_HOME</span>/overlays/community
mkdir -p <span style="color:#000">$COMMUNITY</span>

cat <span style="color:#4e9a06">&lt;&lt;EOF &gt;$COMMUNITY/kustomization.yaml
</span><span style="color:#4e9a06">apiVersion: kustomize.config.k8s.io/v1beta1
</span><span style="color:#4e9a06">kind: Kustomization
</span><span style="color:#4e9a06">
</span><span style="color:#4e9a06">resources:
</span><span style="color:#4e9a06">  - ../../base
</span><span style="color:#4e9a06">
</span><span style="color:#4e9a06">components:
</span><span style="color:#4e9a06">  - ../../components/external_db
</span><span style="color:#4e9a06">  - ../../components/recaptcha
</span><span style="color:#4e9a06">EOF</span>
</code></pre></div><p>Define an <code>enterprise</code> overlay, that bundles the external DB and LDAP
components:</p>
<div class="highlight"><pre style="background-color:#f8f8f8;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-shell" data-lang="shell"><span style="color:#000">ENTERPRISE</span><span style="color:#ce5c00;font-weight:bold">=</span><span style="color:#000">$DEMO_HOME</span>/overlays/enterprise
mkdir -p <span style="color:#000">$ENTERPRISE</span>

cat <span style="color:#4e9a06">&lt;&lt;EOF &gt;$ENTERPRISE/kustomization.yaml
</span><span style="color:#4e9a06">apiVersion: kustomize.config.k8s.io/v1beta1
</span><span style="color:#4e9a06">kind: Kustomization
</span><span style="color:#4e9a06">
</span><span style="color:#4e9a06">resources:
</span><span style="color:#4e9a06">  - ../../base
</span><span style="color:#4e9a06">
</span><span style="color:#4e9a06">components:
</span><span style="color:#4e9a06">  - ../../components/external_db
</span><span style="color:#4e9a06">  - ../../components/ldap
</span><span style="color:#4e9a06">EOF</span>
</code></pre></div><p>Define a <code>dev</code> overlay, that points to all the components and has LDAP
disabled:</p>
<div class="highlight"><pre style="background-color:#f8f8f8;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-shell" data-lang="shell"><span style="color:#000">DEV</span><span style="color:#ce5c00;font-weight:bold">=</span><span style="color:#000">$DEMO_HOME</span>/overlays/dev
mkdir -p <span style="color:#000">$DEV</span>

cat <span style="color:#4e9a06">&lt;&lt;EOF &gt;$DEV/kustomization.yaml
</span><span style="color:#4e9a06">apiVersion: kustomize.config.k8s.io/v1beta1
</span><span style="color:#4e9a06">kind: Kustomization
</span><span style="color:#4e9a06">
</span><span style="color:#4e9a06">resources:
</span><span style="color:#4e9a06">  - ../../base
</span><span style="color:#4e9a06">
</span><span style="color:#4e9a06">components:
</span><span style="color:#4e9a06">  - ../../components/external_db
</span><span style="color:#4e9a06">  #- ../../components/ldap
</span><span style="color:#4e9a06">  - ../../components/recaptcha
</span><span style="color:#4e9a06">EOF</span>
</code></pre></div><p>Now, the workspace has the following directories:</p>
<div class="highlight"><pre style="background-color:#f8f8f8;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-shell" data-lang="shell">├── base
│   ├── deployment.yaml
│   └── kustomization.yaml
├── components
│   ├── external_db
│   │   ├── configmap.yaml
│   │   ├── dbpass.txt
│   │   ├── deployment.yaml
│   │   └── kustomization.yaml
│   ├── ldap
│   │   ├── configmap.yaml
│   │   ├── deployment.yaml
│   │   ├── kustomization.yaml
│   │   └── ldappass.txt
│   └── recaptcha
│       ├── deployment.yaml
│       ├── kustomization.yaml
│       ├── secret_key.txt
│       └── site_key.txt
└── overlays
    ├── community
    │   └── kustomization.yaml
    ├── dev
    │   └── kustomization.yaml
    └── enterprise
        └── kustomization.yaml
</code></pre></div><p>With this structure, you can generate the YAML manifests for each deployment
using <code>kustomize build</code>:</p>
<div class="highlight"><pre style="background-color:#f8f8f8;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-shell" data-lang="shell">kustomize build overlays/community
kustomize build overlays/enterprise
kustomize build overlays/dev
</code></pre></div>
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	<div class="text-muted mt-5 pt-3 border-top">Last modified July 6, 2020: <a  href="https://github.com/kubernetes-sigs/kustomize/commit/1b531c6ac737065d574a9c9f2cdf98cf2873c79e">docs: Add guide for components (1b531c6a)</a>
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